Improvement in metallic roofings



UNITED STATES PATENT OFFICEo oHAELEs A. scoTT,A or CINCINNATI, oEIo.

IMPROVEMENT IN METALLIC ROOFINGS.

Spechilicalion forming part of Letters'Patent No. 146,555, dated January 20, 1874; application filed October 28, 1873.

tive view of the same, as laid upon the roof. Fig. 3 is a vertical cross-section, showing the joint of the ,standing seam. Fig. 4 is a horizontal section of the standing seam, showing the methodof fastening the cap. Fig. 5 is a vertical longitudinal section, showing the lap seams and stays.

This invention relates to an improvement in metallic roofin g, wherebythe plates of which the same is composed are prepared at the shop j, completely ready to be laid and joined together j when on the roof, instead of being partly j formed at the shop and partly while on the roof; and it therefore consists, rst, in a roofing-plate formed completely at the shop, with its end edges folded over and its side edges curved upward, as hereinafter described, ready to be placed in position upon the roof.

That others may fully understand my invention, I will particularly'describe it.

A is one of my roofing-plates completed and ready for shipment or application to the roof. The ends a b are folded in opposite directions, the former being the upper end when the sheet is placed in position upon the roof. When so placed, the adjacent ends of the several sheets lock together in the manner shown in Fig. 5, so that there is a continuous wat-ershed from the upper to the lower edge of the roof. The said locked joint extends uninterruptedly to the side edges c c of the sheets, so that no leak-holes can be produced in the process of fitting and joining.

I am aware a similar lock-j oint is formed in the ordinary tin roofing, but the upturned edges,to form the standing seam, are in that case always formed after the lock-joints have been made and the material in strips has been placed upon `the roof. In this case the edges of the plate are all prepared prior to placing upon the roof, and therefore the said lock-joint is completed after the upturningY of the side edges c c. The side edges c c are not bent upward, with an angle, as is the case with other metallic rooin gs, but are curved upward in the manner shown, because it would not be possible, except by the use of Aa very ductile metal, to fold the edges as at c b, and subsequently to turn the side edges upward,with an angle, without causing the metal of the fold to either buckle or separate; but when curved, as shown, the fold adjusts itself by an apparent shrinkage or expansion. The side edges c c are curved upward, but not past a vertical plane, so that when placed upon the roof side by side the edges of adjacent sheets may be in contact and, practically, parallel for a short distance downward to receive the cap f and admit of the Vsame `being secured by rivets or countersink punch-marks.

My improvement is particularly adapted to the use of sheet-iron, the commonest varieties of which can be worked by my method, but could not beworked in the usual way.

When the several sheets have been locked at their ends, and properly arranged side by side, and secured to the roof-sheathing by cleats c, the caps f are placed in position and secured there by countersinks g, whereby the metal of the parts effectually rivets itself, and the work is completed. The cleats e may, by my method, be applied at the ends of the sheets, as well as along its edges, which is not feasible in the laying of metallic roof by other methods. Afterthe roofing-plates are all position, the lock-joints across the ends are closed and compacted by beating the folds together. y

The advantages of my improvement are, iirst, complet-e preparation at the shoplor fac tory; second, `greater facility iny laying upon the roof 5 third, by the use ofendcleats greater security when laid. j

Having described my invention, what I claim as new, is

A roofing-plate, A, formed with thefolded edges a b and the edges ccV curved upward, as described,so as to meet the edges of theadjacent sheets, as and for the purposesfet fort-h. OHAS. A. SCOTT. Witnesses:

It. D. O. SMITH, E. M. GALLAHER. i 

